Hook support for a closed circuit fluid cooled gas turbine nozzle stage segment

(19)

(11)

EP 1 149 984 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	05.03.2003 Bulletin 2003/10

(43)	Date of publication A2:
	31.10.2001 Bulletin 2001/44

(21)	Application number: 01300119.3

(22)	Date of filing: 08.01.2001

(51)	International Patent Classification (IPC)⁷: F01D 9/04, F01D 25/12, F01D 25/24

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

25.04.2000 US 557541

(71)	Applicant: GENERAL ELECTRIC COMPANY
	Schenectady, NY 12345 (US)

(72)	Inventor:
	Burdgick, Steven Sebastian Schenectady, New York 12303 (US)

(74)	Representative: Pedder, James Cuthbert et al
	GE London Patent Operation, Essex House, 12/13 Essex Street London WC2R 3AA London WC2R 3AA (GB)

(54)	Hook support for a closed circuit fluid cooled gas turbine nozzle stage segment

(57) A nozzle stage segment (10) includes inner and outer bands (14, 12) spaced radially one from the other with a nozzle vane therebetween. The outer band includes a wall (36) defining a portion of the hot gas path (24) flow through the turbine and an outer cover (38) defining a chamber with the outer wall. The vane includes a vane extension (56) integrally cast with the nozzle segment and extending into a vane extension on the cover. The cover mounts a forward hook (30) for structurally mounting the nozzle segment to a fixed part of the turbine casing, thereby establishing a structural load path through the hook, the cover extension and the vane extension upon welding the extension to one another and the outer wall and cover to one another. Cavities (48, 50, 54) in the vane open into the chamber to receive a cooling medium and which cavities and chamber form part of a closed circuit cooling path through the nozzle stage segment.

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